584 lines
21 KiB
Rust
584 lines
21 KiB
Rust
#![allow(clippy::similar_names)] // `expr` and `expn`
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use crate::visitors::expr_visitor_no_bodies;
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use arrayvec::ArrayVec;
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use if_chain::if_chain;
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use rustc_ast::ast::LitKind;
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use rustc_hir::intravisit::Visitor;
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use rustc_hir::{self as hir, Expr, ExprKind, HirId, Node, QPath};
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use rustc_lint::LateContext;
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use rustc_span::def_id::DefId;
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use rustc_span::hygiene::{self, MacroKind, SyntaxContext};
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use rustc_span::{sym, ExpnData, ExpnId, ExpnKind, Span, Symbol};
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use std::ops::ControlFlow;
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const FORMAT_MACRO_DIAG_ITEMS: &[Symbol] = &[
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sym::assert_eq_macro,
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sym::assert_macro,
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sym::assert_ne_macro,
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sym::debug_assert_eq_macro,
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sym::debug_assert_macro,
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sym::debug_assert_ne_macro,
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sym::eprint_macro,
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sym::eprintln_macro,
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sym::format_args_macro,
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sym::format_macro,
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sym::print_macro,
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sym::println_macro,
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sym::std_panic_macro,
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sym::write_macro,
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sym::writeln_macro,
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];
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/// Returns true if a given Macro `DefId` is a format macro (e.g. `println!`)
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pub fn is_format_macro(cx: &LateContext<'_>, macro_def_id: DefId) -> bool {
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if let Some(name) = cx.tcx.get_diagnostic_name(macro_def_id) {
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FORMAT_MACRO_DIAG_ITEMS.contains(&name)
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} else {
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false
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}
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}
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/// A macro call, like `vec![1, 2, 3]`.
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///
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/// Use `tcx.item_name(macro_call.def_id)` to get the macro name.
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/// Even better is to check if it is a diagnostic item.
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///
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/// This structure is similar to `ExpnData` but it precludes desugaring expansions.
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#[derive(Debug)]
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pub struct MacroCall {
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/// Macro `DefId`
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pub def_id: DefId,
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/// Kind of macro
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pub kind: MacroKind,
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/// The expansion produced by the macro call
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pub expn: ExpnId,
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/// Span of the macro call site
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pub span: Span,
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}
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impl MacroCall {
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pub fn is_local(&self) -> bool {
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span_is_local(self.span)
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}
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}
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/// Returns an iterator of expansions that created the given span
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pub fn expn_backtrace(mut span: Span) -> impl Iterator<Item = (ExpnId, ExpnData)> {
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std::iter::from_fn(move || {
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let ctxt = span.ctxt();
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if ctxt == SyntaxContext::root() {
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return None;
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}
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let expn = ctxt.outer_expn();
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let data = expn.expn_data();
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span = data.call_site;
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Some((expn, data))
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})
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}
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/// Checks whether the span is from the root expansion or a locally defined macro
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pub fn span_is_local(span: Span) -> bool {
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!span.from_expansion() || expn_is_local(span.ctxt().outer_expn())
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}
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/// Checks whether the expansion is the root expansion or a locally defined macro
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pub fn expn_is_local(expn: ExpnId) -> bool {
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if expn == ExpnId::root() {
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return true;
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}
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let data = expn.expn_data();
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let backtrace = expn_backtrace(data.call_site);
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std::iter::once((expn, data))
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.chain(backtrace)
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.find_map(|(_, data)| data.macro_def_id)
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.map_or(true, DefId::is_local)
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}
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/// Returns an iterator of macro expansions that created the given span.
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/// Note that desugaring expansions are skipped.
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pub fn macro_backtrace(span: Span) -> impl Iterator<Item = MacroCall> {
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expn_backtrace(span).filter_map(|(expn, data)| match data {
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ExpnData {
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kind: ExpnKind::Macro(kind, _),
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macro_def_id: Some(def_id),
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call_site: span,
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..
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} => Some(MacroCall {
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def_id,
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kind,
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expn,
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span,
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}),
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_ => None,
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})
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}
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/// If the macro backtrace of `span` has a macro call at the root expansion
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/// (i.e. not a nested macro call), returns `Some` with the `MacroCall`
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pub fn root_macro_call(span: Span) -> Option<MacroCall> {
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macro_backtrace(span).last()
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}
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/// Like [`root_macro_call`], but only returns `Some` if `node` is the "first node"
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/// produced by the macro call, as in [`first_node_in_macro`].
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pub fn root_macro_call_first_node(cx: &LateContext<'_>, node: &impl HirNode) -> Option<MacroCall> {
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if first_node_in_macro(cx, node) != Some(ExpnId::root()) {
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return None;
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}
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root_macro_call(node.span())
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}
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/// Like [`macro_backtrace`], but only returns macro calls where `node` is the "first node" of the
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/// macro call, as in [`first_node_in_macro`].
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pub fn first_node_macro_backtrace(cx: &LateContext<'_>, node: &impl HirNode) -> impl Iterator<Item = MacroCall> {
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let span = node.span();
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first_node_in_macro(cx, node)
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.into_iter()
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.flat_map(move |expn| macro_backtrace(span).take_while(move |macro_call| macro_call.expn != expn))
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}
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/// If `node` is the "first node" in a macro expansion, returns `Some` with the `ExpnId` of the
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/// macro call site (i.e. the parent of the macro expansion). This generally means that `node`
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/// is the outermost node of an entire macro expansion, but there are some caveats noted below.
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/// This is useful for finding macro calls while visiting the HIR without processing the macro call
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/// at every node within its expansion.
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///
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/// If you already have immediate access to the parent node, it is simpler to
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/// just check the context of that span directly (e.g. `parent.span.from_expansion()`).
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///
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/// If a macro call is in statement position, it expands to one or more statements.
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/// In that case, each statement *and* their immediate descendants will all yield `Some`
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/// with the `ExpnId` of the containing block.
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///
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/// A node may be the "first node" of multiple macro calls in a macro backtrace.
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/// The expansion of the outermost macro call site is returned in such cases.
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pub fn first_node_in_macro(cx: &LateContext<'_>, node: &impl HirNode) -> Option<ExpnId> {
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// get the macro expansion or return `None` if not found
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// `macro_backtrace` importantly ignores desugaring expansions
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let expn = macro_backtrace(node.span()).next()?.expn;
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// get the parent node, possibly skipping over a statement
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// if the parent is not found, it is sensible to return `Some(root)`
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let hir = cx.tcx.hir();
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let mut parent_iter = hir.parent_iter(node.hir_id());
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let (parent_id, _) = match parent_iter.next() {
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None => return Some(ExpnId::root()),
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Some((_, Node::Stmt(_))) => match parent_iter.next() {
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None => return Some(ExpnId::root()),
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Some(next) => next,
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},
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Some(next) => next,
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};
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// get the macro expansion of the parent node
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let parent_span = hir.span(parent_id);
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let Some(parent_macro_call) = macro_backtrace(parent_span).next() else {
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// the parent node is not in a macro
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return Some(ExpnId::root());
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};
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if parent_macro_call.expn.is_descendant_of(expn) {
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// `node` is input to a macro call
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return None;
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}
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Some(parent_macro_call.expn)
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}
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/* Specific Macro Utils */
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/// Is `def_id` of `std::panic`, `core::panic` or any inner implementation macros
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pub fn is_panic(cx: &LateContext<'_>, def_id: DefId) -> bool {
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let Some(name) = cx.tcx.get_diagnostic_name(def_id) else { return false };
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matches!(
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name.as_str(),
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"core_panic_macro"
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| "std_panic_macro"
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| "core_panic_2015_macro"
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| "std_panic_2015_macro"
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| "core_panic_2021_macro"
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)
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}
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pub enum PanicExpn<'a> {
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/// No arguments - `panic!()`
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Empty,
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/// A string literal or any `&str` - `panic!("message")` or `panic!(message)`
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Str(&'a Expr<'a>),
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/// A single argument that implements `Display` - `panic!("{}", object)`
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Display(&'a Expr<'a>),
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/// Anything else - `panic!("error {}: {}", a, b)`
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Format(FormatArgsExpn<'a>),
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}
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impl<'a> PanicExpn<'a> {
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pub fn parse(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<Self> {
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if !macro_backtrace(expr.span).any(|macro_call| is_panic(cx, macro_call.def_id)) {
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return None;
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}
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let ExprKind::Call(callee, [arg]) = &expr.kind else { return None };
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let ExprKind::Path(QPath::Resolved(_, path)) = &callee.kind else { return None };
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let result = match path.segments.last().unwrap().ident.as_str() {
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"panic" if arg.span.ctxt() == expr.span.ctxt() => Self::Empty,
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"panic" | "panic_str" => Self::Str(arg),
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"panic_display" => {
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let ExprKind::AddrOf(_, _, e) = &arg.kind else { return None };
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Self::Display(e)
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},
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"panic_fmt" => Self::Format(FormatArgsExpn::parse(cx, arg)?),
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_ => return None,
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};
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Some(result)
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}
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}
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/// Finds the arguments of an `assert!` or `debug_assert!` macro call within the macro expansion
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pub fn find_assert_args<'a>(
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cx: &LateContext<'_>,
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expr: &'a Expr<'a>,
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expn: ExpnId,
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) -> Option<(&'a Expr<'a>, PanicExpn<'a>)> {
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find_assert_args_inner(cx, expr, expn).map(|([e], p)| (e, p))
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}
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/// Finds the arguments of an `assert_eq!` or `debug_assert_eq!` macro call within the macro
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/// expansion
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pub fn find_assert_eq_args<'a>(
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cx: &LateContext<'_>,
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expr: &'a Expr<'a>,
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expn: ExpnId,
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) -> Option<(&'a Expr<'a>, &'a Expr<'a>, PanicExpn<'a>)> {
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find_assert_args_inner(cx, expr, expn).map(|([a, b], p)| (a, b, p))
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}
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fn find_assert_args_inner<'a, const N: usize>(
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cx: &LateContext<'_>,
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expr: &'a Expr<'a>,
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expn: ExpnId,
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) -> Option<([&'a Expr<'a>; N], PanicExpn<'a>)> {
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let macro_id = expn.expn_data().macro_def_id?;
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let (expr, expn) = match cx.tcx.item_name(macro_id).as_str().strip_prefix("debug_") {
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None => (expr, expn),
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Some(inner_name) => find_assert_within_debug_assert(cx, expr, expn, Symbol::intern(inner_name))?,
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};
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let mut args = ArrayVec::new();
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let mut panic_expn = None;
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expr_visitor_no_bodies(|e| {
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if args.is_full() {
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if panic_expn.is_none() && e.span.ctxt() != expr.span.ctxt() {
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panic_expn = PanicExpn::parse(cx, e);
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}
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panic_expn.is_none()
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} else if is_assert_arg(cx, e, expn) {
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args.push(e);
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false
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} else {
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true
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}
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})
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.visit_expr(expr);
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let args = args.into_inner().ok()?;
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// if no `panic!(..)` is found, use `PanicExpn::Empty`
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// to indicate that the default assertion message is used
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let panic_expn = panic_expn.unwrap_or(PanicExpn::Empty);
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Some((args, panic_expn))
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}
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fn find_assert_within_debug_assert<'a>(
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cx: &LateContext<'_>,
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expr: &'a Expr<'a>,
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expn: ExpnId,
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assert_name: Symbol,
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) -> Option<(&'a Expr<'a>, ExpnId)> {
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let mut found = None;
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expr_visitor_no_bodies(|e| {
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if found.is_some() || !e.span.from_expansion() {
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return false;
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}
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let e_expn = e.span.ctxt().outer_expn();
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if e_expn == expn {
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return true;
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}
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if e_expn.expn_data().macro_def_id.map(|id| cx.tcx.item_name(id)) == Some(assert_name) {
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found = Some((e, e_expn));
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}
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false
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})
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.visit_expr(expr);
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found
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}
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fn is_assert_arg(cx: &LateContext<'_>, expr: &Expr<'_>, assert_expn: ExpnId) -> bool {
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if !expr.span.from_expansion() {
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return true;
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}
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let result = macro_backtrace(expr.span).try_for_each(|macro_call| {
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if macro_call.expn == assert_expn {
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ControlFlow::Break(false)
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} else {
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match cx.tcx.item_name(macro_call.def_id) {
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// `cfg!(debug_assertions)` in `debug_assert!`
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sym::cfg => ControlFlow::CONTINUE,
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// assert!(other_macro!(..))
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_ => ControlFlow::Break(true),
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}
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}
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});
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match result {
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ControlFlow::Break(is_assert_arg) => is_assert_arg,
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ControlFlow::Continue(()) => true,
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}
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}
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/// A parsed `format_args!` expansion
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#[derive(Debug)]
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pub struct FormatArgsExpn<'tcx> {
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/// Span of the first argument, the format string
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pub format_string_span: Span,
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/// The format string split by formatted args like `{..}`
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pub format_string_parts: Vec<Symbol>,
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/// Values passed after the format string
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pub value_args: Vec<&'tcx Expr<'tcx>>,
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/// Each element is a `value_args` index and a formatting trait (e.g. `sym::Debug`)
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pub formatters: Vec<(usize, Symbol)>,
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/// List of `fmt::v1::Argument { .. }` expressions. If this is empty,
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/// then `formatters` represents the format args (`{..}`).
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/// If this is non-empty, it represents the format args, and the `position`
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/// parameters within the struct expressions are indexes of `formatters`.
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pub specs: Vec<&'tcx Expr<'tcx>>,
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}
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impl<'tcx> FormatArgsExpn<'tcx> {
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/// Parses an expanded `format_args!` or `format_args_nl!` invocation
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pub fn parse(cx: &LateContext<'_>, expr: &'tcx Expr<'tcx>) -> Option<Self> {
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macro_backtrace(expr.span).find(|macro_call| {
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matches!(
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cx.tcx.item_name(macro_call.def_id),
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sym::const_format_args | sym::format_args | sym::format_args_nl
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)
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})?;
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let mut format_string_span: Option<Span> = None;
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let mut format_string_parts: Vec<Symbol> = Vec::new();
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let mut value_args: Vec<&Expr<'_>> = Vec::new();
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let mut formatters: Vec<(usize, Symbol)> = Vec::new();
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let mut specs: Vec<&Expr<'_>> = Vec::new();
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expr_visitor_no_bodies(|e| {
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// if we're still inside of the macro definition...
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if e.span.ctxt() == expr.span.ctxt() {
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// ArgumnetV1::new_<format_trait>(<value>)
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if_chain! {
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if let ExprKind::Call(callee, [val]) = e.kind;
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if let ExprKind::Path(QPath::TypeRelative(ty, seg)) = callee.kind;
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if let hir::TyKind::Path(QPath::Resolved(_, path)) = ty.kind;
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if path.segments.last().unwrap().ident.name == sym::ArgumentV1;
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if seg.ident.name.as_str().starts_with("new_");
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then {
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let val_idx = if_chain! {
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if val.span.ctxt() == expr.span.ctxt();
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if let ExprKind::Field(_, field) = val.kind;
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if let Ok(idx) = field.name.as_str().parse();
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then {
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// tuple index
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idx
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} else {
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// assume the value expression is passed directly
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formatters.len()
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}
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};
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let fmt_trait = match seg.ident.name.as_str() {
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"new_display" => "Display",
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"new_debug" => "Debug",
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"new_lower_exp" => "LowerExp",
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"new_upper_exp" => "UpperExp",
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"new_octal" => "Octal",
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"new_pointer" => "Pointer",
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"new_binary" => "Binary",
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"new_lower_hex" => "LowerHex",
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"new_upper_hex" => "UpperHex",
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_ => unreachable!(),
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};
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formatters.push((val_idx, Symbol::intern(fmt_trait)));
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}
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}
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if let ExprKind::Struct(QPath::Resolved(_, path), ..) = e.kind {
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if path.segments.last().unwrap().ident.name == sym::Argument {
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specs.push(e);
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}
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}
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// walk through the macro expansion
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return true;
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}
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// assume that the first expr with a differing context represents
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// (and has the span of) the format string
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if format_string_span.is_none() {
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format_string_span = Some(e.span);
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let span = e.span;
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// walk the expr and collect string literals which are format string parts
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expr_visitor_no_bodies(|e| {
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if e.span.ctxt() != span.ctxt() {
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// defensive check, probably doesn't happen
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return false;
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}
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if let ExprKind::Lit(lit) = &e.kind {
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if let LitKind::Str(symbol, _s) = lit.node {
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format_string_parts.push(symbol);
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}
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}
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true
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})
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.visit_expr(e);
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} else {
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// assume that any further exprs with a differing context are value args
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value_args.push(e);
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}
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// don't walk anything not from the macro expansion (e.a. inputs)
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false
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})
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.visit_expr(expr);
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Some(FormatArgsExpn {
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format_string_span: format_string_span?,
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format_string_parts,
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value_args,
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formatters,
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specs,
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})
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}
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|
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/// Finds a nested call to `format_args!` within a `format!`-like macro call
|
|
pub fn find_nested(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, expn_id: ExpnId) -> Option<Self> {
|
|
let mut format_args = None;
|
|
expr_visitor_no_bodies(|e| {
|
|
if format_args.is_some() {
|
|
return false;
|
|
}
|
|
let e_ctxt = e.span.ctxt();
|
|
if e_ctxt == expr.span.ctxt() {
|
|
return true;
|
|
}
|
|
if e_ctxt.outer_expn().is_descendant_of(expn_id) {
|
|
format_args = FormatArgsExpn::parse(cx, e);
|
|
}
|
|
false
|
|
})
|
|
.visit_expr(expr);
|
|
format_args
|
|
}
|
|
|
|
/// Returns a vector of `FormatArgsArg`.
|
|
pub fn args(&self) -> Option<Vec<FormatArgsArg<'tcx>>> {
|
|
if self.specs.is_empty() {
|
|
let args = std::iter::zip(&self.value_args, &self.formatters)
|
|
.map(|(value, &(_, format_trait))| FormatArgsArg {
|
|
value,
|
|
format_trait,
|
|
spec: None,
|
|
})
|
|
.collect();
|
|
return Some(args);
|
|
}
|
|
self.specs
|
|
.iter()
|
|
.map(|spec| {
|
|
if_chain! {
|
|
// struct `core::fmt::rt::v1::Argument`
|
|
if let ExprKind::Struct(_, fields, _) = spec.kind;
|
|
if let Some(position_field) = fields.iter().find(|f| f.ident.name == sym::position);
|
|
if let ExprKind::Lit(lit) = &position_field.expr.kind;
|
|
if let LitKind::Int(position, _) = lit.node;
|
|
if let Ok(i) = usize::try_from(position);
|
|
if let Some(&(j, format_trait)) = self.formatters.get(i);
|
|
then {
|
|
Some(FormatArgsArg {
|
|
value: self.value_args[j],
|
|
format_trait,
|
|
spec: Some(spec),
|
|
})
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
/// Source callsite span of all inputs
|
|
pub fn inputs_span(&self) -> Span {
|
|
match *self.value_args {
|
|
[] => self.format_string_span,
|
|
[.., last] => self
|
|
.format_string_span
|
|
.to(hygiene::walk_chain(last.span, self.format_string_span.ctxt())),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Type representing a `FormatArgsExpn`'s format arguments
|
|
pub struct FormatArgsArg<'tcx> {
|
|
/// An element of `value_args` according to `position`
|
|
pub value: &'tcx Expr<'tcx>,
|
|
/// An element of `args` according to `position`
|
|
pub format_trait: Symbol,
|
|
/// An element of `specs`
|
|
pub spec: Option<&'tcx Expr<'tcx>>,
|
|
}
|
|
|
|
impl<'tcx> FormatArgsArg<'tcx> {
|
|
/// Returns true if any formatting parameters are used that would have an effect on strings,
|
|
/// like `{:+2}` instead of just `{}`.
|
|
pub fn has_string_formatting(&self) -> bool {
|
|
self.spec.map_or(false, |spec| {
|
|
// `!` because these conditions check that `self` is unformatted.
|
|
!if_chain! {
|
|
// struct `core::fmt::rt::v1::Argument`
|
|
if let ExprKind::Struct(_, fields, _) = spec.kind;
|
|
if let Some(format_field) = fields.iter().find(|f| f.ident.name == sym::format);
|
|
// struct `core::fmt::rt::v1::FormatSpec`
|
|
if let ExprKind::Struct(_, subfields, _) = format_field.expr.kind;
|
|
if subfields.iter().all(|field| match field.ident.name {
|
|
sym::precision | sym::width => match field.expr.kind {
|
|
ExprKind::Path(QPath::Resolved(_, path)) => {
|
|
path.segments.last().unwrap().ident.name == sym::Implied
|
|
}
|
|
_ => false,
|
|
}
|
|
_ => true,
|
|
});
|
|
then { true } else { false }
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
/// A node with a `HirId` and a `Span`
|
|
pub trait HirNode {
|
|
fn hir_id(&self) -> HirId;
|
|
fn span(&self) -> Span;
|
|
}
|
|
|
|
macro_rules! impl_hir_node {
|
|
($($t:ident),*) => {
|
|
$(impl HirNode for hir::$t<'_> {
|
|
fn hir_id(&self) -> HirId {
|
|
self.hir_id
|
|
}
|
|
fn span(&self) -> Span {
|
|
self.span
|
|
}
|
|
})*
|
|
};
|
|
}
|
|
|
|
impl_hir_node!(Expr, Pat);
|
|
|
|
impl HirNode for hir::Item<'_> {
|
|
fn hir_id(&self) -> HirId {
|
|
self.hir_id()
|
|
}
|
|
|
|
fn span(&self) -> Span {
|
|
self.span
|
|
}
|
|
}
|